// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using Microsoft.Extensions.DependencyInjection;
using System;

namespace FlyingEye.Middlewares.RateLimiting
{
    /// <summary>
    /// Extension methods for the RateLimiting middleware.
    /// </summary>
    public static class RateLimiterServiceCollectionExtensions
    {
        /// <summary>
        /// Add rate limiting services and configure the related options.
        /// </summary>
        /// <param name="services">The <see cref="IServiceCollection"/> for adding services.</param>
        /// <param name="configureOptions">A delegate to configure the <see cref="RateLimiterOptions"/>.</param>
        /// <returns></returns>
        public static IServiceCollection AddRateLimiter(this IServiceCollection services, Action<RateLimiterOptions> configureOptions)
        {
            ArgumentNullException.ThrowIfNull(services);
            ArgumentNullException.ThrowIfNull(configureOptions);

            services.AddRateLimiter();
            services.Configure(configureOptions);
            return services;
        }

        /// <summary>
        /// Add rate limiting services and configure the related options.
        /// </summary>
        /// <param name="services">The <see cref="IServiceCollection"/> for adding services.</param>
        /// <returns></returns>
        public static IServiceCollection AddRateLimiter(this IServiceCollection services)
        {
            ArgumentNullException.ThrowIfNull(services);

            services.AddSingleton<RateLimitingMetrics>();
            return services;
        }
    }
}